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package compat
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"strings"
"github.com/containers/common/pkg/resize"
"github.com/containers/podman/v4/libpod"
"github.com/containers/podman/v4/libpod/define"
"github.com/containers/podman/v4/pkg/api/handlers"
"github.com/containers/podman/v4/pkg/api/handlers/utils"
"github.com/containers/podman/v4/pkg/api/server/idle"
api "github.com/containers/podman/v4/pkg/api/types"
"github.com/containers/podman/v4/pkg/domain/entities"
"github.com/containers/podman/v4/pkg/specgenutil"
"github.com/gorilla/mux"
"github.com/sirupsen/logrus"
)
// ExecCreateHandler creates an exec session for a given container.
func ExecCreateHandler(w http.ResponseWriter, r *http.Request) {
runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
input := new(handlers.ExecCreateConfig)
if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
utils.InternalServerError(w, fmt.Errorf("error decoding request body as JSON: %w", err))
return
}
ctrName := utils.GetName(r)
ctr, err := runtime.LookupContainer(ctrName)
if err != nil {
utils.ContainerNotFound(w, ctrName, err)
return
}
libpodConfig := new(libpod.ExecConfig)
libpodConfig.Command = input.Cmd
libpodConfig.Terminal = input.Tty
libpodConfig.AttachStdin = input.AttachStdin
libpodConfig.AttachStderr = input.AttachStderr
libpodConfig.AttachStdout = input.AttachStdout
if input.DetachKeys != "" {
libpodConfig.DetachKeys = &input.DetachKeys
}
libpodConfig.Environment = make(map[string]string)
for _, envStr := range input.Env {
split := strings.SplitN(envStr, "=", 2)
if len(split) != 2 {
utils.Error(w, http.StatusBadRequest, fmt.Errorf("environment variable %q badly formed, must be key=value", envStr))
return
}
libpodConfig.Environment[split[0]] = split[1]
}
libpodConfig.WorkDir = input.WorkingDir
libpodConfig.Privileged = input.Privileged
libpodConfig.User = input.User
// Make our exit command
storageConfig := runtime.StorageConfig()
runtimeConfig, err := runtime.GetConfig()
if err != nil {
utils.InternalServerError(w, err)
return
}
// Automatically log to syslog if the server has log-level=debug set
exitCommandArgs, err := specgenutil.CreateExitCommandArgs(storageConfig, runtimeConfig, logrus.IsLevelEnabled(logrus.DebugLevel), true, true)
if err != nil {
utils.InternalServerError(w, err)
return
}
libpodConfig.ExitCommand = exitCommandArgs
// Run the exit command after 5 minutes, to mimic Docker's exec cleanup
// behavior.
libpodConfig.ExitCommandDelay = runtimeConfig.Engine.ExitCommandDelay
sessID, err := ctr.ExecCreate(libpodConfig)
if err != nil {
if errors.Is(err, define.ErrCtrStateInvalid) {
// Check if the container is paused. If so, return a 409
state, err := ctr.State()
if err == nil {
// Ignore the error != nil case. We're already
// throwing an InternalServerError below.
if state == define.ContainerStatePaused {
utils.Error(w, http.StatusConflict, fmt.Errorf("cannot create exec session as container %s is paused", ctr.ID()))
return
}
}
}
utils.InternalServerError(w, err)
return
}
utils.WriteResponse(w, http.StatusCreated, entities.IDResponse{ID: sessID})
}
// ExecInspectHandler inspects a given exec session.
func ExecInspectHandler(w http.ResponseWriter, r *http.Request) {
runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
sessionID := mux.Vars(r)["id"]
sessionCtr, err := runtime.GetExecSessionContainer(sessionID)
if err != nil {
utils.Error(w, http.StatusNotFound, err)
return
}
logrus.Debugf("Inspecting exec session %s of container %s", sessionID, sessionCtr.ID())
session, err := sessionCtr.ExecSession(sessionID)
if err != nil {
utils.InternalServerError(w, fmt.Errorf("error retrieving exec session %s from container %s: %w", sessionID, sessionCtr.ID(), err))
return
}
inspectOut, err := session.Inspect()
if err != nil {
utils.InternalServerError(w, err)
return
}
utils.WriteResponse(w, http.StatusOK, inspectOut)
}
// ExecStartHandler runs a given exec session.
func ExecStartHandler(w http.ResponseWriter, r *http.Request) {
runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
sessionID := mux.Vars(r)["id"]
// TODO: We should read/support Tty from here.
bodyParams := new(handlers.ExecStartConfig)
if err := json.NewDecoder(r.Body).Decode(&bodyParams); err != nil {
utils.Error(w, http.StatusBadRequest, fmt.Errorf("failed to decode parameters for %s: %w", r.URL.String(), err))
return
}
// TODO: Verify TTY setting against what inspect session was made with
sessionCtr, err := runtime.GetExecSessionContainer(sessionID)
if err != nil {
utils.Error(w, http.StatusNotFound, err)
return
}
logrus.Debugf("Starting exec session %s of container %s", sessionID, sessionCtr.ID())
state, err := sessionCtr.State()
if err != nil {
utils.InternalServerError(w, err)
return
}
if state != define.ContainerStateRunning {
utils.Error(w, http.StatusConflict, fmt.Errorf("cannot exec in a container that is not running; container %s is %s", sessionCtr.ID(), state.String()))
return
}
if bodyParams.Detach {
// If we are detaching, we do NOT want to hijack.
// Instead, we perform a detached start, and return 200 if
// successful.
if err := sessionCtr.ExecStart(sessionID); err != nil {
utils.InternalServerError(w, err)
return
}
// This is a 200 despite having no content
utils.WriteResponse(w, http.StatusOK, "")
return
}
logErr := func(e error) {
logrus.Error(fmt.Errorf("error attaching to container %s exec session %s: %w", sessionCtr.ID(), sessionID, e))
}
var size *resize.TerminalSize
if bodyParams.Tty && (bodyParams.Height > 0 || bodyParams.Width > 0) {
size = &resize.TerminalSize{
Height: bodyParams.Height,
Width: bodyParams.Width,
}
}
hijackChan := make(chan bool, 1)
err = sessionCtr.ExecHTTPStartAndAttach(sessionID, r, w, nil, nil, nil, hijackChan, size)
if <-hijackChan {
// If connection was Hijacked, we have to signal it's being closed
t := r.Context().Value(api.IdleTrackerKey).(*idle.Tracker)
defer t.Close()
if err != nil {
// Cannot report error to client as a 500 as the Upgrade set status to 101
logErr(err)
}
} else {
// If the Hijack failed we are going to assume we can still inform client of failure
utils.InternalServerError(w, err)
logErr(err)
}
logrus.Debugf("Attach for container %s exec session %s completed successfully", sessionCtr.ID(), sessionID)
}
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